The ceramic one that @HiggsBoson has is a serious looker. That has been my pick for a while in PO lineup.I have a 6.5" (16.5cm), flat wrist. I've tried on both the 39.5mm and the 43.5mm and they would both work for me. I just need to decide whether I want to go for the old school Diver look of the 39.5mm or the newer trend of larger dive watches such as the 43.5mm.
I already have a Seamaster 300MC which is 41mm so I think I have the large dive watch category covered. I might have to go with the 39.5mm.